We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
the idea that too much copper is toxic but muscle meat is very high in zinc and if we don't get copper somewhere in our diet we can get excess zinc which leads to a copper deficiency and a copper deficiency can lead to neurologic symptoms that mimic B12 deficiency you can get posterior column syndrome and other issues so you don't want to get copper deficiency
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and if you over consume zinc without consuming enough copper whether by supplementation or perhaps by eating meat without eating any copper containing foods you can become copper deficient because of the way that zinc and copper are stored in the small intestine in the metallo theanine protein and there's left off together so when people are consuming zinc supplements without copper they can get copper deficient which is a big deal that causes neurologic symptoms that mimic b12 deficiency
The reverse is not true and I have concerns about people who are supplementing with zinc without copper you definitely can't get copper deficient if you do not eat copper rich foods those being liver I think there are some mushrooms like shiitake mushrooms that are good for copper but we need to get copper in our diets and I think liver is a good source and the fact that I'm eating a ton of liver and my copper is nowhere near elevated is a good indication that we don't have to worry about copper in liver causing toxicity
if you over supplement with zinc which i think is happening more and more these days in the covid pandemic people just hear i need zinc i need zinc and they're taking 50 or 100 milligrams of zinc and you don't balance that with copper like would have happened in our ancestors when we were eating liver you're going to get zinc you're going to get copper deficient and copper deficiency can manifest just like b12 deficiency clinically you get sort of posterior column signs balance issues you can get all sorts of problems
people are taking now 50 milligrams plus of zinc per day because they are worried about a virus and then if long term that can lead to problems with hormones and copper deficiency